sudo

If you want to execute a command with root privileges, you normally use the command "sudo". But of course you can execute a command also as any other user. E.g. I need to execute some script for my backup as user "backuppc". then I just type:

sudo -u backuppc /usr/local/backuppc/bin/BackupPC_serverMesg status info

Instead of the username (backuppc) one can also use the user id (uid).

In (K)ubuntu, only sudo is allowed by default. To enable su, execute:

sudo -s -H

To enable graphical root login, edit /etc/kde3/kdm/kdmrc:

AllowRootLogin=true